Wood drill with cutter transversely adjustable in the drill shank



July 11, Q w EN WOOD DRILL WITH CUTTER TRANSVERSELY ADJUSTABLE IN THEDRILL SHANK Filed May 20, 1932 Patented July 11, 1933 UNITED STATESPATENT o ricE CARL WIEHAGEN, OF SDLINGEN-WALD, GERMAKY WOOD DRILL WITHCUTTER TRANSVERSELY ADJUSTABLE INaTI-IE DRILL SHANK Application filedMay 20, 1932, Serial No. 612,547, and in Germany May 27, 1931.

Wood drills are known in which an inclined circular or flat blade isshiftable and fixable in the drill shank.

It is also known, in connection with wood drills, to provide fiat bladestransversely adjustable in the bore shank, with teeth on their edge inwhich teeth a screw rotatable in the bore shank engages foreffecting thedisplacement.

The production of such positively adjustable blades is the morecomplicated and difficult the smaller the diameter of the desired holeto be drilled is. I

The invention relates to a wood drill 35 which differs from the drillsof known construction in that the blade itself is constructed asa'screw, is'adjustable in transverse direction by turning in a femalescrew thread in the shank of circular cross section and is automaticallybrought into the proper cutting position and fixed in this position bymeans of a set screw inserted in the end of the shank and acting on aflat portion of the circumference of the screw.

The blade in screw-shape is easy to produce and easy. to adjust. v

An embodiment of the invention isillustrated by way of example in theaccompanying drawing in which:

Fig. 1 shows the drill in elevation.

Fig. 2 is a similar viewto Fig. 1, the end of the drill shank being invertical cross section.

Fig. 3 is an elevation partly in section seen at right angles to Figs. 1and 2.

The adjustable blade or provided with a cutter a merges into a screw mby means of which it is screwed into a female screw thread in a hole 6in the drill shank b so that by rotating the screw a the blade isadjusted in transverse direction. The pitch of the fine thread of thescrew as 'and of the hole 5 do not allow accidental shifting of theblade during the drilling operation, and a set screw cin the drill shankb acting against'the screw (0' prevents an unintentional turning ofthescrew 411?.

The fine screw thread of the screw a and of the hole I b in the shank bis preferably of such pitch that, in the case of metric screw thread,the blade 0; is shifted a certain distance, for example mm, during afull revolution of the screw a The hole I) in theshank b is inclined sothat the cutter .w of the blade a is free tocut..

Iclaim:- v I A wood drill, comprising in combination a drillshank havinga screw threaded transverse bore, a screw having a flattened portionshiftable in said bore, a blade formed on the end of said screw adaptedto be shifted transversely relative to, said shank by near the end ofsaid shank adapted to bear In testimony whereof I afiix mysignature.

CARL WIEHAGEN.

.the turning of said screw, and a set screw

